gdb/i386b-nat.c

   1 /* Native-dependent code for BSD Unix running on i386's, for GDB.
   2    Copyright 1988, 1989, 1991, 1992, 1994, 1996 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21
  22 #ifdef FETCH_INFERIOR_REGISTERS
  23 #include <sys/types.h>
  24 #include <sys/ptrace.h>
  25 #include <machine/reg.h>
  26 #include <machine/frame.h>
  27 #include "inferior.h"
  28
  29 void
  30 fetch_inferior_registers(regno)
  31      int regno;
  32 {
  33   struct reg inferior_registers;
  34
  35   ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &inferior_registers, 0);
  36   memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4*NUM_REGS);
  37   registers_fetched ();
  38 }
  39
  40 void
  41 store_inferior_registers(regno)
  42      int regno;
  43 {
  44   struct reg inferior_registers;
  45
  46   memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4*NUM_REGS);
  47   ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &inferior_registers, 0);
  48 }
  49
  50 struct md_core {
  51   struct reg intreg;
  52   struct fpreg freg;
  53 };
  54
  55 void
  56 fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
  57      char *core_reg_sect;
  58      unsigned core_reg_size;
  59      int which;
  60      CORE_ADDR ignore;
  61 {
  62   struct md_core *core_reg = (struct md_core *)core_reg_sect;
  63
  64   /* integer registers */
  65   memcpy(&registers[REGISTER_BYTE (0)], &core_reg->intreg,
  66          sizeof(struct reg));
  67   /* floating point registers */
  68   /* XXX */
  69 }
  70
  71 #else
  72
  73 #include <machine/reg.h>
  74
  75 /* this table must line up with REGISTER_NAMES in tm-i386.h */
  76 /* symbols like 'tEAX' come from <machine/reg.h> */
  77 static int tregmap[] =
  78 {
  79   tEAX, tECX, tEDX, tEBX,
  80   tESP, tEBP, tESI, tEDI,
  81   tEIP, tEFLAGS, tCS, tSS
  82 };
  83
  84 #ifdef sEAX
  85 static int sregmap[] =
  86 {
  87   sEAX, sECX, sEDX, sEBX,
  88   sESP, sEBP, sESI, sEDI,
  89   sEIP, sEFLAGS, sCS, sSS
  90 };
  91 #else /* No sEAX */
  92
  93 /* FreeBSD has decided to collapse the s* and t* symbols.  So if the s*
  94    ones aren't around, use the t* ones for sregmap too.  */
  95
  96 static int sregmap[] =
  97 {
  98   tEAX, tECX, tEDX, tEBX,
  99   tESP, tEBP, tESI, tEDI,
 100   tEIP, tEFLAGS, tCS, tSS
 101 };
 102 #endif /* No sEAX */
 103
 104 /* blockend is the value of u.u_ar0, and points to the
 105    place where ES is stored.  */
 106
 107 int
 108 i386_register_u_addr (blockend, regnum)
 109      int blockend;
 110      int regnum;
 111 {
 112   /* The following condition is a kludge to get at the proper register map
 113      depending upon the state of pcb_flag.
 114      The proper condition would be
 115      if (u.u_pcb.pcb_flag & FM_TRAP)
 116      but that would require a ptrace call here and wouldn't work
 117      for corefiles.  */
 118
 119   if (blockend < 0x1fcc)
 120     return (blockend + 4 * tregmap[regnum]);
 121   else
 122     return (blockend + 4 * sregmap[regnum]);
 123 }
 124
 125 #endif /* !FETCH_INFERIOR_REGISTERS */
 126
 127 #ifdef FLOAT_INFO
 128 #include "expression.h"
 129 #include "language.h"                   /* for local_hex_string */
 130 #include "floatformat.h"
 131
 132 #include <sys/param.h>
 133 #include <sys/dir.h>
 134 #include <signal.h>
 135 #include <sys/ioctl.h>
 136 #include <fcntl.h>
 137
 138 #include <a.out.h>
 139
 140 #include <sys/time.h>
 141 #include <sys/resource.h>
 142 #include <sys/uio.h>
 143 #define curpcb Xcurpcb  /* XXX avoid leaking declaration from pcb.h */
 144 #include <sys/user.h>
 145 #undef curpcb
 146 #include <sys/file.h>
 147 #include "gdb_stat.h"
 148 #include <sys/ptrace.h>
 149
 150 extern void print_387_control_word ();          /* i387-tdep.h */
 151 extern void print_387_status_word ();
 152
 153 #define fpstate         save87
 154 #define U_FPSTATE(u)    u.u_pcb.pcb_savefpu
 155
 156 struct env387
 157 {
 158   unsigned short control;
 159   unsigned short r0;
 160   unsigned short status;
 161   unsigned short r1;
 162   unsigned short tag;
 163   unsigned short r2;
 164   unsigned long eip;
 165   unsigned short code_seg;
 166   unsigned short opcode;
 167   unsigned long operand;
 168   unsigned short operand_seg;
 169   unsigned short r3;
 170   unsigned char regs[8][10];
 171 };
 172
 173 static void
 174 print_387_status (status, ep)
 175      unsigned short status;
 176      struct env387 *ep;
 177 {
 178   int i;
 179   int bothstatus;
 180   int top;
 181   int fpreg;
 182
 183   bothstatus = ((status != 0) && (ep->status != 0));
 184   if (status != 0)
 185     {
 186       if (bothstatus)
 187         printf_unfiltered ("u: ");
 188       print_387_status_word ((unsigned int)status);
 189     }
 190
 191   if (ep->status != 0)
 192     {
 193       if (bothstatus)
 194         printf_unfiltered ("e: ");
 195       print_387_status_word ((unsigned int)ep->status);
 196     }
 197
 198   print_387_control_word ((unsigned int)ep->control);
 199   printf_unfiltered ("last exception: ");
 200   printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
 201   printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
 202   printf_unfiltered ("%s; ", local_hex_string(ep->eip));
 203   printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
 204   printf_unfiltered (":%s\n", local_hex_string(ep->operand));
 205
 206   top = (ep->status >> 11) & 7;
 207
 208   printf_unfiltered ("regno     tag  msb              lsb  value\n");
 209   for (fpreg = 7; fpreg >= 0; fpreg--)
 210     {
 211       double val;
 212
 213       printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
 214
 215       switch ((ep->tag >> (fpreg * 2)) & 3)
 216         {
 217         case 0: printf_unfiltered ("valid "); break;
 218         case 1: printf_unfiltered ("zero  "); break;
 219         case 2: printf_unfiltered ("trap  "); break;
 220         case 3: printf_unfiltered ("empty "); break;
 221         }
 222       for (i = 9; i >= 0; i--)
 223         printf_unfiltered ("%02x", ep->regs[fpreg][i]);
 224
 225       floatformat_to_double(&floatformat_i387_ext, (char *) ep->regs[fpreg],
 226                               &val);
 227       printf_unfiltered ("  %g\n", val);
 228     }
 229 }
 230
 231 i386_float_info ()
 232 {
 233   struct user u; /* just for address computations */
 234   int i;
 235   /* fpstate defined in <sys/user.h> */
 236   struct fpstate *fpstatep;
 237   char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
 238   unsigned int uaddr;
 239   char fpvalid;
 240   unsigned int rounded_addr;
 241   unsigned int rounded_size;
 242   /*extern int corechan;*/
 243   int skip;
 244   extern int inferior_pid;
 245
 246   uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
 247   if (inferior_pid)
 248     {
 249       int *ip;
 250
 251       rounded_addr = uaddr & -sizeof (int);
 252       rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
 253                       sizeof (int) - 1) / sizeof (int);
 254       skip = uaddr - rounded_addr;
 255
 256       ip = (int *)buf;
 257       for (i = 0; i < rounded_size; i++)
 258         {
 259           *ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t)rounded_addr, 0);
 260           rounded_addr += sizeof (int);
 261         }
 262     }
 263   else
 264     {
 265       printf("float info: can't do a core file (yet)\n");
 266       return;
 267 #if 0
 268       if (lseek (corechan, uaddr, 0) < 0)
 269         perror_with_name ("seek on core file");
 270       if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
 271         perror_with_name ("read from core file");
 272       skip = 0;
 273 #endif
 274     }
 275
 276   print_387_status (0, (struct env387 *)buf);
 277 }
 278
 279 int
 280 kernel_u_size ()
 281 {
 282   return (sizeof (struct user));
 283 }
 284
 285 #endif